Have pain in leg. Had a fight earlier, couldn t even bend the leg now. Is it a serious issue?

I had an altercation with someone, resulting in a fight. After it was over and done with, i was experiencing pain in my leg. I started limping because it hurt. I iced it & a small area started to turn blue, looking like a bruise. I left it alone. Next day, it hurt even worse. It hurts to move my leg, especially when i have to bend it. And it has a small lump under it, nothing big. Should i be worried?